Fix three code bugs

[arusatech]

Fixes a log listener removal bug, aligns Android session and completion parameter names with TypeScript, and normalizes saveSession return handling.

This PR addresses three distinct issues:

1. Log Listener Removal: The addNativeLogListener's remove function could incorrectly remove the last listener if the target listener was already absent, due to Array#indexOf returning -1.
2. Android Session API Mismatch: Android's loadSession and saveSession expected a path parameter, while the TypeScript API provided filepath, leading to session operations failing. The saveSession return in TS is also normalized for robustness.
3. Android Completion Parameter Mismatch: The Android completion method expected a temp parameter, but the TypeScript API sent temperature, causing the temperature setting to be ignored.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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